Mount Adams is a potentially active stratovolcano in the Cascade Range. It is the second-highest mountain in the U.S. state of Washington, trailing only Mount Rainier. Adams is a member of the Cascade Volcanic Arc, and is one of the arc's largest volcanoes, located in a remote wilderness approximately 31 miles (50 km) east of Mount St. Helens. The Mount Adams Wilderness comprises the upper and western part of the volcano's cone.